The Application of MHD Side Stirrer Technology to Aluminium Melting Furnaces for Operational Efficiency Improvement A Case Study
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1 The Application of MHD Side Stirrer Technology to Aluminium Melting Furnaces for Operational Efficiency Improvement A Case Study Presented by Alan M Peel C.Eng Managing Director, ALTEK Group Pierre Yves Menet CONSTELLIUM Technology Centre, Voreppe
2 Agenda Why Stir a melting furnace? EM Stirring Technology - How does it work? ALTEK Air Cooled Technology Side Mounted Stirrer Operation Some operational Benefits and Results Summary
3 Why Stir a furnace?
4 Why STIR the metal in recycling? HEAT SCRAP The ICEBERG effect!!
5 Heat Transfer in the melt cycle Start of melt cycle Radiated Heat Transfer Start of melt cycle Radiated Heat Transfer Start of melt cycle Start of melt cycle Radiated and conductive Heat Transfer
6 Furnace Heat Transfer Conduction + convection
7 Re cap Why STIR the metal? Improved heat transfer efficiency of the furnace Improved temperature homogeneity Improved chemical homogeneity Reduced energy consumption Reduced cycle time increased production Reduced dross generation Easier dross skimming Less damage to refractory Consistent accuracy of temperature reduced pit waiting time and out of specification casts Door closed stirring (minimised door open time)
8 Bath surface temperature 782 C The Temperature of the metal is the single most controllable factor that determines dross generation in a furnace.
9 EM Circulation How it works?
10 History Growth in EM Devices
11 EM Stirring How it works EM Stirring well proven Over 700 applications
12 Stirring Velocity Effects
13 Furnace Stirring If high alloy (such as 5xxx etc.) OR Scrap as part of charge Stirring will: Reduce dross (10 to 30%) Increase productivity (10 to 20%) Improve quality Reduce energy...a Good Practice
14 EM Stirring Metal Movement This bath is 1000mm deep
15 EM Stirring Technology
16 EM Stirring Older technology 1. Required water for cooling medium - More complex installation water quality, piping, back up systems - Safety concerns with water in basement area under furnace 2. High energy consumption - Higher operating costs 3. Quite inflexible controllability - Reduces effects within melting cycle 4. Limited application capability - could not easily be fitted as side mount
17 EM Stirring A New Approach 1. Simple and reliable construction 2. No water in the inductor no water in furnace basement area lower risk and less complicated installation 3. Novel inductor design and control techniques leading to significantly lower power consumption 4. Side Mount capability 5. Multiple furnace capability 6. Lower installation cost and work required % UK manufacture and full CE compliance
18 ALTEK EM Stirrers Original design has been operating for 10 years in RUSAL group 40 References Bottom or side mounted Available for refractory/ss plate thickness combinations of :- 400mm, 500mm and 700mm Individual furnace or multiple furnace applications Air cooled
19 Cooling Requirements Power = I² R Where R = r* l/s Where: r = resistance l = length s = area of inductor Cooling requirements How can we get away with air cooling only? Essentially the bigger the cross section area of the copper (we have a solid copper bar), the smaller the power!
20 Inductor Construction HEAT Impact of solid Cu over Cu tube HEAT Resistivity effect... I² R effect on heating...and therefore cooling requirement Also nothing to go wrong with solid bar, compared to wear, holes, build up in tubes..
21 Inductor Manufacture PICTURE 100% manufactured in house by ALTEK Ensures control of quality Ensures reliability in operation Also nothing to go wrong with solid bar, compared to wear, holes, build up in tubes..
22 Stirrer Cooling HEAT COOL AIR Air Cooling Fan HEAT WATER
23 The consequence Lower Energy Cost Comparison between ALTEK Air Cooled induction Stirring and conventional 'type' Water Cooled Induction Stirring for electrical operating costs based on 60 Tonne dome type furnace installation - ONE Stirrer only 350, , ,000 Euro 200, , ,000 50, Years ALTEK Air Cooled Alternative Water Cooled
24 APPLICATIONS
25 Simple Bottom Mounted Installation
26 Simple Bottom mounted Extrusion Melting Furance
27 TOP CHARGE FURNACE Recycling Furnaces
28 Bottom Mounted Top Charge Furnaces Bottom Mounted Type 700 Can work through 700+ mm of refractory/ss plate and insulation Ideal for dome type top charge furnaces Picture is HULAMIN in South Africa Others references are: Kaiser Trentwood Bridgenorth Aluminium (UK) (ELVAL)
29 Bottom Mounted Top Charge Furnaces Large US Dome Furnace 750mm Hearth
30 Multiple Furnace Operations
31 Multiple Furnace Operation Fully automatic with scissor lift and electrically driven trolley for multi furnace operation
32 Operational Benefits at CONSTELLIUM Neuf Brisach Plant, France
33 Operational Benefits Production Increase Energy Reduction Temperature Homogeneity Alloying Efficiency Dross Reduction
34 Side Mounted Stirrer Installation Side Mounted at Neuf Brisach 400mm thick refractory wall
35 Side Mounted Stirrer Installation Side mounted type fitted to a 70T dry hearth stationary melting furnace
36 Charge Composition
37 Melt Rate Performance results Melting Rate (T solid charge) Stirrer No Yes /6 2/6 3/6 4/6 5/6 1 20% Increase in melt rate
38 Energy Reduction Performance results Melting Energy Cons. (kwh/t sol.chg) Stirrer No Yes /6 2/6 3/6 4/6 5/6 1 15% Energy Reduction in energy consumption (gas)
39 Temperature Homogeneity
40 Alloying Efficiency
41 Dross Reduction EM Stirring Melter Dross Holder Dross Melter + Holder total Avg. ratio (%) Avg.ratio (%) Avg. ratio (%) No Yes Dross Reduction of > 25%
42 Furnace Cycle Energy Usage Stirrer setting and power consumption % % 20 80% kwh kwh % 40% Stirrer Setting 5 20% Time (secs) 0%
43 Summary The operating results over a 3-year period have demonstrated the following benefits:- Specific energy consumption reduction (-10 to 15%) Productivity increase (ca. +15 to 20%) through reduction of melting time and alloying time Dross generation reduction (ca. -10 to 20%) As a consequence CONSTELLIUM have invested in further ALTEK Siber Force Stirrers
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